Conor McGregor has set the sporting world alight once again this week with his incredible performances as one half of the Mayweather-McGregor press tour.

The UFC Lightweight champion may have gone a bit too far last night, however, as he took his trash-talking to the next level when he screamed expletives at Showtimes Sports executive Stephen Espinoza, calling him a weasel in a move which even managed to earn laughs from Mayweather's side of the stage.

Espinoza has responded to the foul-mouthed rant, telling MMAFighting.com that he isn't sure if it was "part of the show".

"I’m not sure how much is a put on" he said. "It seemed more than that. It certainly wasn’t a wink and a nod. And it wasn’t backstage saying, ‘Hey, I’m doing it for the good of the show.’

Stephen Espinoza (Image: Ethan Miller/Getty Images)

"The reality is you see with some athletes, whether combat sports or otherwise, the need to invent enemies and invent opponents to motivate. He’s obviously got that in Floyd. If this is part of his process of imagining the world against him and motivating himself, then that’s his process.

"I’m a big boy. It’s certainly not somebody that has come after me as a network. It did take me a little bit by surprise, but it’s part of the entertainment value of the McGregor business."

The 'McGregor business' will roll into two more cities on this tour before all eyes turn to the T-Mobile Arena in Las Vegas on August 26th when the pair face off. Espinoza threatened the possibility of retorting on stage to Conor in the MMA Fighting interview, but isn't sure